The conventional high-strength tooth crown resins have problems in terms of attrition resistance and abrasion resistance. Conquest ®, which was developed to improve these problems, recently came onto the market and has been used in generalclinical practice. Therefore, Conquest® with Dental Color ® and Thermoresin LC II, commercially available conventional high strength resins, were compared in terms of the following basic physical properties: compressive strength, compressive yield strength, transverse strength, elastic modulus, transverse deflection, knoop hardness, and brush abrasion ratio.The transverse strength of Conquest® was about three-fold greater than that of Thermoresin LC II. Its elastic modulus was also about 3.6-fold greater than that of Thermoresin LC II. However, thetransverse deflection of Conquest ® was less than that of Dental Color ® or Thermoresin LC II. Its brush abrasion ratio was lower than that of the other two types of resin.
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Ishigami et al. (1996) studied this question.
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